Switch and signaling device



Jan. 10, 1928.

1,655,759 DAVIS ET AL SWITCH AND SIGNALING DEVICE Filed Nov.2l. 1924 2 Sheets-Sheet 1 Jan. 10, 1928. 1,ss,759

L. DAVIS ET AL SWITCH AND SIGNALING DEVICE Filed Nov.21. 1924 2 Sheets-Sheet 2 INVENTORS TTORNEY.

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Patented Jan. 1%, i928.

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TREVALYN DAVIS AND LEO E. GABDT, OF CINCINNATI, OHIO.

SWITCH AND SIGNALING DEVICE.

Application filed November 21, 1924. Serial No. 751,382.

a switching and signaling device, which,

when made up and wired, can be placed in a compact carrying case, thus making it portable. it is also verysii'nple in construction and operation, andhighly eliicient in all broadcasting work.

in order to do the signaling or broad casting we use an extra wire in connection with the regular wiring system between all the implements and parts The switching device is so hooked up that we may, throw the signal and microphone in the circuit instantly and siinultanemisly, signaling the spealmr, musicians for their particular use. or forothcrs when the particular microphone is ready forone of them, which heretofore has been done by hand signaling, or by personal i1..tructions when to begin, causing a commotion and oftentimes considerable talkand comment to go out into the air, making it very embarrass ing for the particular broadcasting station and the announcer.

using our switch and signal box and giving a few simple instructions before each, program, everything will go very smoothly for the announcer or manager in charge, also enabling him by the signal light to tell just what is going on, when any microphone is in the circuit. For example, if it is desired to have the orcl'icstra play at a banquet and it is their time to begin, by throwing the switch the inicroplmue nearest to them will l'iecoine ready for use and a signal light will be turned on so theorchestra knows they can b 5111 playing. If one of the speakers at the banquet, who is sitting at the spealn ers table is ready to speak according to the program, the microphone nearest to the speakers table will be thrown into opera-- tive action and a signal light lit simultaneously so the speaker knows that he is to commence talking, Without any instructions, or hand signaling or other comments.

By using this device, it will enable the an plitier operator to put his whole time in modulating the volume, or it can be operated by him very conveniently when connected close to the amplifier,

the various advantages and features of the invention and details of construction and (mcration will readily become apparent from reading the spcciticatimi and claims.

In the accompanying drawing, forming part of this specification:

Fig. l, a complete diagrammatic View of the systen'i, including our switching and signaling device, 7

Fig. 2, is a diagrammatic view of the microphone, and signal light,

Fig. 3, is a diagrammatic view of the output switches,

l, is a diagrammatic view of a telephone circuit,

Fig. 5, a diagrammatic view, of the monitoring circuit,

e, is an isometric view of our portable carrying and containing case, the work ing parts of the device or system being carried therein, 1 r v T, is a similar view with the front door or lid opened, and

Fl 8, is a similar view with the rear door or cover open. i

lnthe drawing, the switch and signaling device as a unit is marked 1, the transmitt or microphones 2, 2, 2 and 2 there being four in number in the present instance, and they each carry the signal lights 3, i 3 and 3 respectively. The amplifier is marked 4 and the telephone 5.

In order to operate the switch and signal device, we provide a switch case as 1, in which we place an arrangement used for the switch and signal purposes and we will now describe some of the details thereof.

The transmitter or microphone wires are formed in groups of four, A, B, C, and D. 'lhcse form jacks as shown in llig. 3, and can be operated by and thrimgh the levers or keys 1O, 11, 152 or 13, independently or together as the operator desires.

T he transmitters 9., 2, 2 and are operated from the electric contact device or box 1, as follows: If the transmitter 2 is to be used, the lever 10 thrown into operative connection for connecting the group of wires l) in the group of wires l the current thus passing the amplifier el and out through the broadcasting line F. p I

If the transmitter 2 is not at a convenient point, any of the other transmitters or miby lever or key 12, and the microphone 2 by lever or key 13. In operating any of these transmitters or microphonesthe signal lights 3, 3, 3 or 8 will light up simultaneously therewith, and show which transmitter or microphone can be used.

These signal lights are wired. to and 0011-, nected with an ordinary 12 volt A battery used in broadcasting, and not shown here, as well known in the art.

The signal light wire is marked 7 and terms one part of the circuit, the lamps or lights being grounded to the base 8, which, in turn, grounded to the metal shield 9, oi the groups oi? wires A, B. C, and D.

It the operator desires to communicate with the broadcast ng station itself, the telephone 5 is used by stablishing communications through the wires In order to do this the plug key or lever ll is with drawn, which closes the circuit, after the phone plugs 15 have been connected to the telephone.

A monitoring circuit is provided by in sorting plug or key 16 and this can he done at any time.

In order to eliminate the click in broad casting, the plug 17 is pulled out, which shorts the circuit.

Our microphone switch and signaling device maybe used inc-onnection with any system oi wiring other than that herein described, and the switch box for making the same portable may be of any construction desired and found practical. It may be used in connection with any style of microphone and amplifier and in connection with any telephone system or broadcasting system, as it will be just as efiicient in its operation in simultaneously connecting the microphone for operation and the signal light. One or more microphones may be brought into the circuit at the same time.

-The signal light wires may be connected up in any desired form found convenient for use.

.Vhat we claim as new and our invention and desire to secure by Letters Patent is:

1. In a. switch and signal device of the character described, a multiplicity of microphones and a signal light for each, in combination with a switch, means electri "ally connecting said microphones, said switch and said signals together, said switch capable of being operated to simultaneously place one or more of said microphones in the circuit in condition for use in broadcasting and light one or more 01" said signal lights, said switch and connections capable of be ng asscinblec and made portable.

E3. in a switch and signal device of the char cter described, a multiplicity of mi crophones and a visual signal for each, in combination with a switch, means electrically conncc in said microphones, said switch and the visual signals together, said switch capable of being operated to simultaneously place one or more of said microphones in the circuit in condition for use in broadcasting and to control the actuation of one or more of said visual signals, said switch and connections capable of being assembled and made portable.

in testimonywhereot, we our signatures at Cincinnati, Ghio, this 19th day of November, 1924.

TREVALYN DAVIS. LEO E. G'ARDT. 

